package com.xiao.newfarm.utils;

import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.security.MessageDigest;
import java.util.Arrays;

/**
 * @Author xiaoxiaoping
 * @Date 2020/6/6 17:17
 * @Version 1.0
 */
@Component
public class WxUtils {
	
	public static final String token="weixin"; //这个记住
	
	private static final String appId ="wx0fc59e64f118f08e";
	
	private static final String appSecret = "982cd5368a7348da178cb5c0e661d53b";
	
	private static final String ACCESS_TOKEN_URL="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
	
	private static final Logger logger = (Logger) LoggerFactory.getLogger(WxUtils.class);
	
	@Autowired
	private  RedisUtil redisUtil;
	
	public   boolean checkSignature(String signature,String timestamp,String nonce) {
			//根据微信的规则验证 是否接入成功
			String[] arr=new String[] {token, timestamp,nonce};
			Arrays.sort(arr);
			StringBuffer content= new StringBuffer();
			for(int i=0;i<arr.length;i++) {
				content.append(arr[i]);
			}
			String temp=getSha1(content.toString());//加密
			return temp.equals(signature);
		}
		
		public  String getSha1(String str) {
			if (str == null || str.length() == 0) {
				return null;
			}
			char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
					'a', 'b', 'c', 'd', 'e', 'f' };
			
			try {
				MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
				mdTemp.update(str.getBytes("UTF-8"));
				
				byte[] md = mdTemp.digest();
				int j = md.length;
				char buf[] = new char[j * 2];
				int k = 0;
				for (int i = 0; i < j; i++) {
					byte byte0 = md[i];
					buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
					buf[k++] = hexDigits[byte0 & 0xf];
				}
				return new String(buf);
			} catch (Exception e) {
				return null;
			}
		}
		
	public  String  getAccessToken() throws Exception {
		String accessToken = null;
		long expiresIn =0;
		String key = "access_token";
		if(redisUtil.hasKey(key)){
			return (String) redisUtil.get(key);
		}
		String requestUrl = ACCESS_TOKEN_URL.replace("APPID", appId).replace("APPSECRET", appSecret);
		JSONObject jsonObject = JSONObject.parseObject( HttpUtil.getRest(requestUrl,null));
		if (null != jsonObject) {
			try {
				accessToken = jsonObject.getString("access_token");
				expiresIn = jsonObject.getLongValue("expires_in");
				redisUtil.set(key,expiresIn);
			} catch (JSONException e) {
				// 获取token失败
				logger.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInteger("errcode"), jsonObject.getString("errmsg"));
			}
		}
		return accessToken;
	}

	
}
